chuck fob woodworking tools



March 15, 1938. T. 1 HEDGPETH CHUCK FOR WOODWORKING TOOLS Original Filed May 2, 1935 III/Il lll/W fil.

STATES PATENT orties CHUCK FOR WODWGRKING TOOLS Theron L. Hedgpeth, Oak Park, lll., assignor to Duro Metal Products Company, Chicago, Ill., a corporation of Illinois Original application May 2, 1935, Serial No.v 19,335. Divided and this application December 31, 1936, Serial No. 118,427 v 2 claims.- (oi. 287-107) The present invention relates to chucksv for (not shown) the sleeve I and with it the shaft wood Working tools, particularly of the type I3 and cutter 20 may be moved to any of a plutermed shapers. Some of the features of the rality of predetermined elevations and clamped invention, however, are of universal application by means of a member 2l.

5 to other types of tools and I do not Wish to be The shaft I3 (Fig. 2) is provided with a suitlimited in the application of my invention exable head 22 consisting of an enlarged cylindrical cept as set forth in the appended claims. portion provided with threads 23. The head 22 This application is a division of my prior` applihas an axially projecting cylindrical portion 24 cation Serial No. 19,335 filed May 2, 1935 for of reduced size and above that, in Fig. 2, an align- Wood working tools, which has resulted in the ing cylindrical portion 25 of slightly larger size. 10 issuance of Patent No. 2,076,511, dated April 6, The portion 25 is accurately ground to cylindri- 1937. cal form and accurately located in axial position One of the objects of the invention is the prowith respect to the axis of shaft 13 as its funcvision of an improved chuck for wood working tion is that of effecting an axial alignment of 15 tools, which is adapted to align accurately the the cutter 20. The purpose of the reduced cylin- 15 axis of the rotating cutter with the axis of the drical portion 24 is that by the removal of this drive shaft. material at the reduced portion 24 it is assured l Another object of the invention is the provision that there will be no fillet in the corner between of an improved chuck for wood working tools the head and the cylindrical portion 25 which having a cutter which is positive in its securemight interfere with the aligning function of the 20 ment, accurate in its alignment, and speedy in its cylindrical portion 25.

application whereby a tool of one size may The head 22 is provided with a threaded chuck be quickly removed and that of another size sleeve 26 which has a threaded bore 2l adapted quickly installed. l to receive the threaded head 22. The chuck Another object of the invention is the provisleeve 26 has a bore 28 communicating with and 25 sion of an improved chuck Ystructure which is forming an extension of ythe threaded bore 21. capable of economical manufacture so that it The sleeve is also provided with a tapered bore may be applied to Wood working tools which can or frusto conical surface 29 for engaging a cutter be sold at a low cost and thus placed within the holder 30. The cutter holder 30 comprises a 30 reach of a larger number of users. substantially cylindrical rod 3l which is threaded 30 Other objects and advantages of the invention at its upper end to receive the nut and lock. nut will be apparent from the following description 32, 33 which secure the cutter 20 in place. Varand the accompanying drawing, in which similar ious types and shapes of cutters may be emcharacters of reference indicate similar parts ployed, all of which are provided with an axially 35 throughout the several views. extending bore 35; for receiving the rod 3l and 35 Referring to the single sheet of drawings ac- With suitably Shaped Cutting edges 35. companying this specification: The cutter holder 30 is provided with a at an- Fig. 1 is a vertical sectional view taken through nular surface 38 at the lower end of the rod 3l a Shaper on a vertical plane, passing through and the upper end of a head 31. The cutter 2t is the axis of the vertical drive shaft showing the lsecured by being clamped between the nut 33 40 application of the invention to a wood working and the annular surface 36. The head 31 of the tool, and cutter holder is provided with an accurately ma- Fig. 2 is a fragmentary elevational view sho-W- chined and axially located cylindrical bore 3B ing the upper end of a drive shaft and the details which has a close sliding flt on the cylindrical of construction of the present chuck. portion 25 of the shaft. The head 31 is prefer- 45 Referring to Fig. 1, Il] indicates in its entirety ably undercut at 39 so as to assure lack of interthe shaper to which the invention has been apference between any other part inside the bore plied, comprising a base II, a table I2 secured 3B and the cylindrical part 25. Thus, the cutter thereto and suitable means for supporting the holder 3l) is lined up with the shaft i3 by the rotating cutter shaft I3 as follows. The base interengagement Of the Cylindrical Surfaces 25 50 Il carries a sleeve I4 having another sleeve I5 and 38. The lower end 40 of the cutter holder slidably mounted therein and rotatably suplies against a flat annular shoulder 4l on the porting the shaft I3 by the ball bearings I6, I1. head 22.v The shaft is driven by means of a pulley I8 and In order to assure the xity of the cutter holder belt I9. By means of a suitable arrangement with respect to rotation on the shaft 13, the

holder 353 may be Yprovided wih a bore 4Z and the shaft i3 may be provided with a bore 43. A pin fili, which has a drive fit in bore 43, slides into the bore d2 when the cutter holder is secured in the chuck. This prevents rotation between the cutter holder and the shaft.

The cutter holder is provided with an external frusto conical surface i5 ofisuch size that its largest portion will not pass the aperture 46 in the end of the sleeve 26. VThe sleeve 26 may then be threaded on the threaded head 22 to draw the cutter holder 3Q flatly against the annular surface di. The alignment of the cutter holder with the shaft, howevenis not determined by the location of the sleeve 26 which might be out of axial alignment due to the cutting of the threads 23. Threads are frequently-cut in such manner that the'cutter may shift to one side or the other, dependent upon the softness of the material and thus the threads may not'be axial ly located with respect toi-the shaft i3. Y

It will thus be observed that I have inventedl an improved chuck for wood working tools which is adapted to be used for securing cutters of various sizes on the drive shaft. The tool is usually provided with a number of cutter holders 45 having tcol supporting shafts or rods Y3l of different size, as the larger cutters may require a larger holder. These holders may be removed very quickly by merely turning the sleeve 25 until it has been removed from the threads 23, and another larger or smaller holder may be substituted. The present chuck assures an accurate alignment of the cutter holder with the drive shaft. A holder may be employed, if desired, for every different cutter, thereby facilitatingthe changing of cutters in a shorter period o-f time.

While I have thus illustrated and described a preferred embodiment of my invention, many modifications may be made without departing from the spirit of the invention, and I do not wish to be limited to the precise details` set forth, but desire to avail myself of all changes within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Pattent of the United States is:

l. A chuck for wood working tools, comprising a driveV shaft with an enlarged cylindrical threaded head, said head having a iiat annular surface at right angles to the axis of said shaft and an axially located reduced cylindrical portion, a threaded chuck sleeve adapted to be threadedly engaged with and disengaged from said enlarged threaded head of the drive shaft and having an inner frusto-conical surface spaced and tapered away from said threads, and a driven shaft with a hollow headed portion adapted toreceive the said reduced cylindrical portion of the drive shaft, having a flat end surface at right angles to the axis of the driven shaft adapted to rest on said flat annular surface of said threaded head of the drive shaft, said hollow headed portion of the driven shaft having an exterior frusto-conical surface complementaryV to the frusto-conical surface on said chuck sleeve, whereby the flat end surface ofthe hollow headed driven shaft will engage true with the fiat annular surface of the threaded head on the drive shaft when said complementary frusto-conical surfaces are wedged together by the forward threading of said chuck sleeve onto the threaded head of the drive shaft for true alignment of the respective driven'and drive shafts.

2. A chuck for wood working tools, comprising a drive shaft with an enlarged cylindrical threaded head, said head having a flat annular surface at right angles to the axis cf said shaft and an axially located reduced cylindrical portion, a threaded chuck sleeve adapted to be threadedly engaged with and disengaged from said enlarged threaded head of the drive shaft and having an innerfrusto-conical surface spaced and tapered away from said threads, a driven shaft with a hollow headed portion adapted to receive the said reduced cylindrical portion of the drive shaft having a flat end surface at right angles to the axis o-f the driven shaft adapted to rest on said flat annular surface of the threaded head of said drive shaft, said hollow headed portion of the driven shaft having an exterior frusto-conical surface complementary to the frusto-conical surface on said chuck sleeve, and a vertically extending pin seated in the enlarged threaded head of the drive shaft projecting upwardly from the flat surface thereof into an aligned opening in the flat end surface of the hollow head member on the driven shaft to prevent relative rotation of the said shafts in connection.

THERON L. HEDGPETH. 

